Drawing press



W. KLOCKE.

DRAWING PRESS. APPLICATION man MAR.20, 1920.

Patented Jan. 31,1922.

INVENOR- 2 SHEETS-SHEET I.

By Allom, $0M. Zm

W. KLOCKE.

DRAWING PRESS.

APPLICATION FILED MAR. 20. 1920.

r "Patented Jan. 31, 1922. 2 SHEETSSHEET2.

INVENTOR NITED STATES PATENT OFFICE.

WILLIAM KLOCKE, OF-WOODHAVEN. NEW YORK, ASSIGNOR T E. W. BLISS COMYANY, OF BROOKLYN, NEW YORK, A CORPORATIONOF WEST VIRGINIA.

DRAWING PRESS.

Mower Specification of Letters Patent. Patented Jan. 311, 1922..

Application filed March 20, 1920. Serial No. 367,469.

To all whom it may concern:

Be it known that I, WILLIAM KLOCKE, a citizen of the United States of America,

residing in Woodhaven, in the borough and county of' Queens, city and State of New it is customary to make the bottom of the die yieldable, whereby the said bottom yields unden the pressure of the punch when the punch "presses the bottom of the shell against-,ithe bottom of the die, thereby to secure a sharp impression upon the bottom of the shell. The re-action of the bottom of the die against the shell, held by the blank holder, when the punch recedes, is apt to collapse the shell, particularly in the case of shells drawn from thin sheets.

The present invention provides means for preventing the collapsing of the drawn shell when the punch recedes, and further provides a means whereby said result may be obtained without involving a slowing down of the speed of the press over its ordinary speed for ordinary drawing or general drawing.

The invention further provides certain combinations and sub-combinations of parts,

providing means for carrying out the foregoing purposes, and cognate purposes, hereinafter set forth, and defined in the annexed claims.

An embodiment of the invention is illustrated in the accompanying drawings.

In said drawings,

Figure 1 is a composite view, partly in elevation and partly in section of a press embodying the invention, only so much of the press being shown as is necessary to illustrate the invention.

Fig. 2 is a sectional view, the section being substantially on the line IIII,

Fig. 1 and the parts being somewhat enlarged. I

Fig. 3 is-a detail view partly in section on the line IIIIII Fig. 2.

Referring to said drawings, A designates a punch slide which is reciprocated back and forth in the usual manner. B designates the punch fixed to said punch slide. C designates a blank holder slide, which is reciprocated in the usual manner, with a dwell in the blank holding position (see the position shown in Fig. 1). The blank holder slide has attached thereto the blank holder D. G designates a die having a yieldablebottom portion H the pressure against the bottom portion II being transmitted through pins Ion a plate K, to springs L anchored on the beam M hung from the bed of the press.

When a blank is held between the blank holder and die, and the punch B strikes the blank on its working stroke, it carries the bottom portion H, the punch B continuing somewhat its stroke after the shell is brought against the bottom portion of the 'die, thereby causing the said bottom portion H to yield to a limited extent.

Means O areprovided for preventing the bottom portion H of the die, under the re-action of the springs L, from collapsing or buckling the drawn shell X When the punch B moves out of the shell on its back stroke.

These means are adapted to restrain or limit the action of said springs L in returning said bottom portion H of the die during the initial retiring movement of the blank holder D, whereby the said bottom" portion H is .prevented from compressing the drawn shell between the said bottom portion H and the blank holder D. These means preferably comprise a sleeve 10, preferably connected to the bottom portion'H of the die through the plate K and rods I, and a rod 12, which latter preferably telescopes with said sleeve 10 for guiding purposes,

and the sleeve 10 conveniently carries a on the rod 12 when the bottom portion H of the die is depressed by the punch B, the

- bottom portion H carrying with it the plate K and the sleeve 10. The rods 12 are.

catch 14 adapted to engage a shoulder '15- 1 55 v the last thirt tion H compressin the shell X against the blank holder D. his regulated movement is most conveniently effected by connecting the rods 12 to the blank holder slide, as indicated at 16. --The bottom plate H is thereby held against the re-action of the springs L until the blank holder D begins to retire, and the said bottom portion H thereafter moves at no greater speed than that of the blank holder D, so that there is no pressure, or no ob'e tionable pressure, of the bottom portion ,against the shell X during 'the return of the said bottom portion H to its initial or original position.

In order to prevent the shoulder 15 reengaging the catch 14 on. the succeeding clamping stroke of the blank holder, means are provided for drawing and holding the catch 14 out of engaging position with the shoulder 15. These means conveniently oomprise a rod 20 havin a stop 21- thereon, in the form of a nut, a apted tIo engage a tail 23 on the catch 14, when the bottom portion H and plate K are in initial position, and thereby hold the catch 14 out of the path ofthe shoulder 15. The blank holder may thereupon approach the die without depressing the bottom portion H of the die, the shoulder 15 on the rod 12 sliding past the catch 14. When, however, the bottom portion H of the die is depressed by the unch B, as heretofore described, the plate and sleeve 10. will be depressed, in which depressed position the catch 14 will be'free to fall behind and engage the shoulder 15, thereby preventing the re-action 'of the springs L against the bottom portion H of the die and consequently against the shell X clamped between the blank holder and die on the upstroke of the blank-holder D.

Means are also preferably provided for assuring the engagement of the catch 14 with the shoulder 15 on the rod 12. These means preferably comprise a lever 30 having a forked end 31 adapted to bear upon the sleeve 10, and pivoted at its other end as indicated at 32, on a block 33 on an upri ht 34, and a rod 39, attached to the punch shde as indicated at 40, is provided Ffor striking the lever 30 between its fulcrum. A oint and point of bearing on the sleeve 101 he length of the rod 30 is preferably such that its end does not strike against the lever-30 until the last part of the movement of the punch slide on its pressure stroke, as for example =second inch of movement of the punch sli e, and the relation of the point of contact of the rod 39 on the lever 30 and the fulcrum 32 of the lever is preferably such that a small amount of motion imparted to the said lever 30 by the rod 39 will be multiplied at the 'forked end 31 of the lever in such mannerthat the sleeve 10 has imparted thereto an appreciably greater amount of movement than the movement of the rod 39 after it contacts with the lever 30. The sleeve 10 carrying the catch 14 is thereby depressed to a somewhat greater extent than would invariably be the case by the punch B, hence the sleeve 10 is assuredly depressed to an extent which will enable the catch 14 to engage the shoulder 15. action of the rod 39 and of the lever 30 is such as to assure the action of the parts in catching to hold the bottom portion H of the die depressed, notwithstanding any looseness or sprin in the parts, or sli ht variations in the t ickness of the sheet eing drawn.

As many means 0 for restraining the return of the bottom portion H of the die, and associated parts, may be provided as may be desired. In the press shown, our such means are employed, two on either side of the vertical perpendicular mid-planes of the press.

The

ably connected to their actuating parts by adjustable means, as indicated at 50 so that the restraining devices can be accommodated to the differences of operation of thepress.

Operation: A blank X being placed between the blankholder'D and the die G, the said parts are moved together to clamp the marginal portion olf the said blank. The punch D thereupon advances and draws the blank,X into the die G, carrying it against the bottom portion H of the die, the said bottom portion H moving against the resistance of the springs L and thereby in conjunction with the punch pressing and shaping the bottom of the drawn blank. As this bottom portion H is moved down by the to a point where the catches 14 thereon engage with the rods 12 which are fast to the blank-holder slide C, and thereby prevent the springs Lreturning the bottom portion H of the die when the punch B retires, it being understood that the blank-holder slide C does not begin its retiring movement until after the punch B has begun its retiring movement. Moreover, H ofthe die is locked to theblank-holder slide C through the means 0 (com rising parts 10, 12,) the said bottom portion cannot move faster than the blank-holder slide (3, and hence there is bottom portion H acting to ueeze or 001- lapse the drawn blank or artic e against the blank-holder. To insure engagement of the catches 14 with the rods 12, rods 39 on the punch slide A, may strike the levers 30, at the final part of the movement of the punch B, and thereby give the rods 10 a slight additional downward movement which insuges engagement'of the catches 14with the ro s 12.

as the bottom portion no possibility of the The inventive ideas herein set forth may receive other embodiments than that herein specifically illustrated and described.

What is claimed is:

l. A drawing press, comprising a die havin a yieldable bottom portion, a blankho der movable toward and from said die, a punch adapted to draw a blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom following each stroke of the punch, and means for restraining the action of said returning means during the retiring movement -of said blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blank-holder.

2. A drawing press, comprising a die havin a yieldable bottom portion, a blankho der movable toward and from said die, a punch adapted to draw a blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom following each stroke of the punch, and means for restraining the action of said returning means during the retiring movement of said blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blankholder, said restraining means comprising a part movable during the retiring movement of said blank-holder and not in advance of the latter, for catching said bottom portion in depressed position.

3. A drawing press, comprising a die having a yieldable bottom portion, a blank-' holder-movable toward and from said die, a punch adapted to draw a blank-held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom being adapted to yield under the ac tion of said punch, means for returning said bottom following each stroke of the punch, and means for restraining the action of said returning means during the retiring movement of said blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blank-holder, said restraining means comprising a device adapted to be interposed between the blank-holder and said bottom plate and limit the upward movement of said bottom plate to that of said blankholder.

4. A drawing press, comprising a die havin a yieldable bottom portion, a blank ho der movable toward and from said die,

a punch adapted to drawa blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom following each stroke of the punch. and means for restraining the action of said returning means during the retiring move ment of said blank-holder, whereby'said bottom portion is prevented from compressing said drawn shell between itself and said blank-holder, said restrainin means comprising a part connected wit said blankholder and a art connected with said bottom plate, an a catch on one part adapted to engage said other part after the bottom plate is depressed and has initiated its re turn movement.

5. A drawing press, comprising a die having a yieldable bottom portion, a blank-- holder movable toward and from said die, a punch adapted to draw a blank held between said die and blank-holder, said. punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom following each stroke of the punch, and means for restraining the action of said returning means during the retiring movement of said blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blank-holder, said restraining means comprising a part connected with said blankholder and a part connected with said bottom portion, and a catch on one part adapted to engage said other part after the bottom portion is depressed and hasinitiated its return movement, and means for imparting an extra movement to said part connected to said bottom portion at the extreme of its depression to insure the engagement of said part by said catch.

6. A drawing press, comprising a die having a yieldable bottom portion, a blanlc holder movable toward and fromsaid die, a punch adapted to draw a blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom holder, said restraining means comprising a drawn shell between itself and said blankpart connected with said blank-holder and a part connected with said bottom portion, and a catch on one part adapted to engage said other part after the bottom portion is depressed and has initiated its return movement, and means for imparting an extra movement to said part Connected to said bottom portion at the extreme of its depression to insure the engagement of said part by said catch, said means comprising a lever bearing upon said part connected with said bottom and a part connected with said punch adapted to strike said lever between its fulcrum and point of bearing on said part connected with said bottom plate.

7. A drawing press, comprising a die having a yieldable bottom portion, a blankholder movable toward and from said die, a

punch adapted to draw a blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said yieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom following each stroke of the punch, and means for restraining the action of said re- I turning means during the retiring movement ofsaid blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blankholder, said restraining means comprising a part connected with sa1d blank-holder and a part connected with said bottom portion, and a catch on one part adapted to engage said other part after the bottom portion is 'depressed and has initiated its return movement, and means for holding said catch out of engaging position when the said bottom portion is in its upper position whereby said blank-holder may descend without effect upon said bottom portion.

8. A drawing press, comprising a die having a yieldable bottom portion, -a blankholder movable toward and from said die, a punch adapted to draw a blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down. against said yieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom following each stroke of the punch, and means for restrainingthe action of said returning means during the retiring movement of said blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blankholder, said restraining means comprising telescoping parts between said bottom portion and blank-holder, and a catch device between said telescoping parts adapted to catch when said bottom portion is depressed by the punch and hold said bottom portion and blank-holder in spaced relationship.

9. A drawing press, comprising a die having a yieldable bottom portion, a blankholder movable toward and from said die, a punch adapted to draw a blank held between said die and blank-holder, said punch being adapted to press the drawn metal shell down against said vieldable bottom, said bottom being adapted to yield under the action of said punch, means for returning said bottom portion following each stroke of the punch, and means for restraining the action of said returning means during the retiring movement of said blank-holder, whereby said bottom portion is prevented from compressing said drawn shell between itself and said blank-holder, said restraining means comprising telescoping parts between said bot tom portion and blank holder, and a catch device between said telescoping parts adapted to catch when the said bottom portion is depressed by the punch and hold the said bottom portion and blank-holder in spaced relationship, and means for holding said catch device out of operative position and permitting said telescoping parts to come together on the downward movement of the blank-holder.

In witness whereof, I have hereunto signed my name.

WILLIAM KLOCKE. 

